A simplified chemorheological model of viscosity evolution for solvent containing resol resin in <scp>RTM</scp> process

Yi, Xiaolin; Xiao, Kun; Kong, Lei; Dong, Xia; Feng, Zhihai; Wang, Dujin

doi:10.1002/app.45282

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…NR and its composites have been adopted extensively for high‐tech applications, such as those in aerospace . On the basis of the previous results, the modified PI fibers were used to fabricate high‐performance PI‐fiber‐reinforced NR composites.…”

Section: Resultsmentioning

confidence: 99%

“…Interfacial Adhesion and Mechanical Properties of the PI-NR Composites NR and its composites have been adopted extensively for hightech applications, such as those in aerospace. 36 On the basis of the previous results, the modified PI fibers were used to fabricate high-performance PI-fiber-reinforced NR composites. First, we evaluated the interfacial properties between the PI fibers and NR by the single-fiber microdroplet method.…”

Section: Microstructure Evolution Of Fibers During the Hydrolysis Promentioning

confidence: 99%

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Surface modification of polyimide fibers by novel alkaline–solvent hydrolysis to form high‐performance fiber‐reinforced composites

Xiao

Zhang

et al. 2018

J of Applied Polymer Sci

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We modified polyimide (PI) fibers by a novel hydrolysis approach and fabricated PI‐fiber‐reinforced novolac resin (NR) composites with enhanced mechanical properties. We first used an alkaline–solvent mixture containing potassium hydroxide liquor and dimethylacetamide (DMAc) for the surface modification of the PI fibers. The results indicate that the surface roughness and structure of the PI fibers were controlled by the hydrolysis time and the content of DMAc. With the optimized hydrolysis conditions, the tensile modulus of modified PI fibers improved 15% without compromises in the fracture stress, fracture strain, or thermal stability. The interfacial shear strength between the modified PI fibers and NR increased 57%; this indicated a highly enhanced interfacial adhesion. Finally, the tensile and flexural strengths of the composites increased 72 and 53%, respectively. This research provides an effective method for the surface modification of PI fibers and expands their applications for high‐performance composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46595.

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Section: Resultsmentioning

confidence: 99%

Section: Microstructure Evolution Of Fibers During the Hydrolysis Promentioning

confidence: 99%

Surface modification of polyimide fibers by novel alkaline–solvent hydrolysis to form high‐performance fiber‐reinforced composites

Xiao

Zhang

et al. 2018

J of Applied Polymer Sci

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“…Many empirical correlations are used to describe viscosity dependence with temperature and time. [ 1,3,19,20,22 ] In this work, the correlation proposed in Zhou et al [ 19 ] for an epoxy resin, was used. This correlation was based on the dual‐Arrhenius model given by

μ_{resin} = 1.138 \times 10^{- 11} e^{(\frac{7248.5623}{T} + 1.587 \times 10^{9} e^{(- \frac{7735.0037}{T})} t)}

where, T is the temperature (K) and t is the time (s).…”

Section: Methodsmentioning

confidence: 99%

“…In these processes, the final quality of the manufactured pieces, in terms of mechanical properties, is highly influenced by the correct specification and control of process parameters such as injection pressure and positioning of inlet/outlet vents. Moreover, control and modeling of the thermophysical properties of the resin and reinforcement medium is also important, thus many studies on resin viscosity [1][2][3] and reinforcement permeability [4][5][6][7][8] are also found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the resin transfer molding process including viscosity dependence with time and temperature

et al. 2021

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Flow behavior inside the mold cavity of liquid molding processes such as resin transfer molding (RTM) is important information that is necessary to determine filling time and void formation. Most of the studies found in the literature use isothermal models with Newtonian fluids and constant viscosities. However, for some specific applications, the mold filling time dependence on temperature and the viscosity dependence on time and temperature must be considered to precisely predict the flow advance inside the mold. In this study, a viscosity model, that accounts for temperature and time dependence is coupled with a standard computational fluid dynamics (CFD) model to simulate the resin advance inside an RTM mold cavity. The model is simpler than similar methods that describe viscosity as a function of temperature and resin conversion. Nevertheless, the results show that the proposed model is capable of calculating flow advance, air and resin temperatures, and viscosity changes with time and temperature as expected in actual RTM and correlated processing of thick parts or with low injection pressure or high fiber content.

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“…Gascons 17 considered the temperature distribution in the thickness direction and proposed a through-the-thickness temperature numerical simulation model for RTM process. Yi et al 18 proposed a simplified resin model in RTM process. Ding and Jia 19 proposed a mathematical model of nonisothermal RTM with sensitivity analysis.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal simulation on pressure during resin transfer molding

Yang

Xiang

et al. 2019

J of Applied Polymer Sci

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High speed injection has been widely used in resin transfer molding (RTM), which improves manufacturing efficiency. This sometimes leads to excessive pressure within the mold, resulting in fiber destruction and mold deformation. Heating the mold and injection resin reduces the viscosity of resin, leading to influence on mold internal pressure. Selection of optimal mold and injection temperature for effective reduction of mold internal pressure has become a source of concern in the polymer industry. This article presents an outlook relationship between mold temperature, injection temperature, and mold internal pressure. It also showcases a temperature selection method angle to addressing this issue. The “FLUENT” software has been secondarily developed that gives an insight in using the three‐dimensional nonisothermal RTM simulation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47492.

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A simplified chemorheological model of viscosity evolution for solvent containing resol resin in RTM process

Cited by 10 publications

References 28 publications

Surface modification of polyimide fibers by novel alkaline–solvent hydrolysis to form high‐performance fiber‐reinforced composites

Surface modification of polyimide fibers by novel alkaline–solvent hydrolysis to form high‐performance fiber‐reinforced composites

Modeling of the resin transfer molding process including viscosity dependence with time and temperature

Nonisothermal simulation on pressure during resin transfer molding

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